Sharpless 101 (Sh2-101) is a H II regionemission nebula located in the constellation Cygnus. It is sometimes also called the Tulip Nebula because it appears to resemble the outline of a tulip when imaged photographically. It was catalogued by astronomer Stewart Sharpless in his 1959 catalog of nebulae. It lies at a distance of about 6,000 light-years (5.7×1016 km; 3.5×1016 mi) from Earth.

NGC 6791 is an open star cluster in the Lyra constellation.It was discovered by Friedrich August Theodor Winnecke in 1853. At roughly 8 billion years old, and with an Iron to Hydrogen abundance ratio that is more than twice that of the Sun, it is one of the oldest and most metal-rich clusters in the Milky Way. This is contrary to the typical rule-of-thumb where older means more metal-poor. Compounded with the fact that it has an unusually high population of stars, NGC 6791 is among the most studied clusters in the sky.

Tags:

Obj. type:

Description:

And here , to cap off a month-long collaboration, how long it take to conduct to a census this very hard variable system, the final registration with the VSX system EA GSC 00777 to 00241 located in the Gemini constellation, it is a fast

IC 417 Spider Nebula stack of over 20 hrs in L 30x900" and Ha 28x900" and 46x600" RGB from a dslr image (...taken with the same setup last year!), calibrated and stacked and processed in Pixinsight and CS5.